Jameh Mosque of Isfahan

Begin with your feet. The ground here is brick, worn smooth and slightly uneven, warm in the afternoon and cool in the shade of the arcades. Look up and you see more brick. It is pale, honey-coloured and dusty, laid in patterns that change from one bay to the next. The noise of the bazaar fades behind you. In its place you hear footsteps, pigeons, and perhaps a few voices from the far side of the courtyard.

This is the Jameh Mosque of Isfahan. Its name means the Friday Mosque. A Friday mosque is the main congregational mosque of a city, where people gathered for the weekly communal prayer. Most famous buildings record one moment in time. This one records many. People have worshipped on this site for more than a thousand years, and almost every major dynasty that ruled Isfahan added something, repaired something, or rebuilt something.

The earliest mosque here dates back to the early centuries of Islam in Iran, under the Abbasid caliphs. They were the dynasty that ruled from Baghdad. Little of that first building is visible today. The mosque grew over it, layer upon layer, much as a tree adds rings. Archaeologists have studied this site closely, because so many phases sit in one place. For historians of Islamic architecture, this is one of the most important buildings in the world to learn from.

The great transformation came in the eleventh and twelfth centuries, under the Seljuks. They were a Turkic dynasty who made Isfahan one of their capitals. They gave the courtyard the form you see around you now. There is a large open rectangle, and on each of its four sides stands a tall arched hall called an iwan. An iwan is a vaulted space, closed on three sides and open to the courtyard on the fourth.

Here is the first surprise. This four-iwan plan became a model. Mosques, madrasas, and caravanserais across Iran and Central Asia later used the same arrangement. Many visitors walk past these four arches and assume the design was always common. In fact, this courtyard is one of the earliest and clearest examples of it. Much of what you may see in other Iranian cities follows ideas that were tested and shaped here.

Now turn toward the south side, the side that faces Mecca. Behind the southern iwan rises a large brick dome. It was commissioned in the late eleventh century by Nizam al-Mulk, the powerful vizier, or chief minister, of the Seljuk sultan. Stand beneath it if you can. The dome rests on corner structures called squinches. They turn the square room below into a round base for the dome above. The engineering is plain to see, with no tiles to hide it.

Now for the second surprise, and it is a human one. On the opposite side of the mosque, to the north, stands a smaller dome. It is often called the brown dome. It was built only a few years after the southern one, by Taj al-Mulk. He was a court official and a well-known rival of Nizam al-Mulk. Two ambitious men each left a dome in the same building. Many architects consider the smaller northern dome the more refined of the two, because its proportions are especially precise.

As you walk through the covered halls between the iwans, pay attention to the ceilings. There are hundreds of small brick vaults here, and many are different from their neighbours. Some have ribs. Some have star shapes. Some have interlocking geometric patterns that seem to turn as you move beneath them. Builders over several centuries experimented here. For this reason, people sometimes describe the mosque as a museum of the brick vault.

One more treasure lies in a side hall. It is a prayer niche, or mihrab, made of carved stucco. Stucco is a fine plaster that can be shaped while it is still soft. This mihrab dates from the early fourteenth century, during Ilkhanid rule. The Ilkhanids were a Mongol dynasty that ruled Iran. The plaster is cut into deep layers of flowing script, vines, and flowers. Look closely and you will see how several layers of ornament sit one on top of another.

Then return to the courtyard and look again at the iwans. Much of the blue and turquoise tilework on their faces is later. It comes mainly from the Safavid period, when Isfahan became the imperial capital of Iran. This is the part that most visitors photograph. But remember what is underneath. Behind the bright glazed surface stand the older Seljuk brick walls, and the tiles were applied over them.

The mosque has also come through difficult times. During the Iran–Iraq War in the 1980s, part of the complex was damaged in an air raid and later restored. In 2012, UNESCO inscribed the mosque on its World Heritage List. UNESCO recognised it as a key example of how mosque architecture developed over about twelve centuries. Restoration work continues in different corners, so you may see scaffolding or fresh brick in some places.

The mosque does not stand alone. It sits at the heart of Isfahan's old city, connected to the long covered bazaar that runs south toward Naqsh-e Jahan Square. For centuries, trade and worship lived side by side here. Merchants closed their stalls, prayed, and returned to work. Even today, the lanes outside smell of spices, copper, and fresh bread. The mosque feels less like a monument and more like part of a living neighbourhood.

Before you leave, stand for a moment in the centre of the courtyard. Turn slowly in a full circle. Look at the four iwans, the two domes, and the brick and tile from many eras. They were made by people who never met each other, separated by hundreds of years, and yet they share one space. As you walk back into the bazaar, notice the brick under your feet once more. It is the same material that holds up the domes above you.